Five years ago, John Ransom chose to imprison himself rather than continue living as the assassin known as "Neptune," a weapon of the lethal cadre called the Pantheon. Cut off from the world, Ransom hoped to tame the violence within and find redemption for his sins. But now he is free. A chance encounter with pirates on the Indian Ocean leads Ransom to Singapore, where a sliver of the Pantheon awaits. And when the bodies of the pirates wash ashore, Ransom is forced to investigate. Drawn back into conflict and mystery, Ransom is faced with a dangerous decision -- will he continue to deny what he is, or should Neptune rise from the shadows and strike back?